1. Fuel valve
2. Pumping element
3. Fuel discharge
4. Filling and flowing back channel
1. Fuel valve
2. Pumping element
3. Fuel discharge
4. Filling and flowing back channel
60669
Figure 227
Filling phase
During the filling phase, the pumping element (2) moves to
its upper position.
The highest cam position is passed and the rocker roller gets
closer to the cam basic circle.
The fuel valve (1) is open and the fuel can flow into the
injector from the lower channel (4) of the cylinder head.
The filling phase continues until the pumping element has
reached its upper end-of-stroke position.
60670
Figure 228
Injection phase
The injection phase starts when, during the pumping element
descending phase, the solenoid valve is energized and the fuel
valve (1) closes. Delivery start time, properly processed by
the electronic control unit, depends on engine operating
conditions. Through the rocker, the cam continues to
activate the pumping element (2) and the injection phase
continues as long as the fuel valve is closed (1).
ENGINE - F3B
133
ASTRA HD8Ec
SECTION 3
Injection phases
